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The continuous current rating is a basic design criterion of GIS for bus and contact sizing. The complex structure of GIS allows close influence of the different devices such as circuit breakers, ground switches, disconnect switches, current transformers, voltage transformers, and bus bars in terms of heat dissipation and temperature rise. For this reason, the IEEE and IEC standards require temperature rise tests to confirm the correct function of all devices included in GIS. A so‐called typical bay configuration will be used for this test.

One of the factors specific to a GIS installation may show that the rated continuous current may be different for the bus bar or the feeders depending on the substations’ scheme. Typical rated continuous currents are shown in Table 1.6.